Throttle-valve for locomotives.



T. H. WALKER. THROTTLE VALVE FOR LOCOMOTIVES.

APPLICATION TILED SEPT. 26,.1912.

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QSHEETSr-SHBET 2.

T. H. WALKER.

THROTTLE, VALVE FOR LOCOMOTIVES.

APPLICATION FILED SEPT. 26. 1912.

7116 H We? %w14W/ K i UNITED STATES PATENT omen.

THOMAS H. WALKER, OI PHILADELPHIA, PENNSYLVANIA, ASSIGNOB TO THE BALDWIN LOCOMOTIVE WORKS, OF PHILADELPHIA, PENNSYLVANIA, A COB-PO- anion or PENNSYLVANIA. v,

THROTTLE-VALVE FORLOCOMOTIVES.

Specification of Letters Patent.

Patented Jan. 26, 1915.

Application ill ed Icptembcr 28, 1912. Serial No. 722,500.

To all whom it may concern:

Be it known that I, THOMAS H. WALKaR, a citizen of the United 'States, residing in Philadelphia, Pennsylvania, have invented certain Improvements in- Throttle-Valves for Locomotives, of which the following is a specification.

One object of my invention is to so design the throttle valve and the dome of a locomotive boiler in which the throttle valve is located, that the opening in the dome can be used as a man hole through which to enter the boiler, dispensin with a separate man hole heretofore used in locomotive boiler construction.

A further object of the invention is to so design the throttle valve as to rovide for the proper flow of the steam -t rough the valve when the valve is open.

These ob'ects I attain in the followingmanner, re erence being had to the accom panying drawings, in which I Figure 1, is a longitudinal sectio'nal'view of the upper portion of the locomotive boiler and dome, also showing the throttle valve in section; the section being on the line 1-1, Fig. 2; Fig. 2, is a transverse sectional view on the line 2'2, Fig. 1; and Fig. 3, is a sectional plan view on the line 3-3, Fig. 1.

A is the shell of the boiler.

B is the dome into which the throttle valve extends. This dome has an opening 6 of sufilcient size to allow for the passage of a man through the opening and into the interior of the boiler. This opening is closed by a suitable cap B bolted to the come.

D is the throttle valve casing located at one side of the center of the dome, as clearly illustrated in Fig. 1, and supported in the ordinary manner by a bar C secured to the casing at the upper end and extendin from one slde to the other of the dome. T e upper end of the casing is carried well up to the top of the dome to obtain dry steam,

and is beveled, as at d, so as to allow suflicient space for an entrance into the boiler throu h the opening in the dome, as mentione above. v

The lower end d of the casing is circular in cross section and is attached to the pipe E by a U-shaped hanger c. The upper ends of this hanger exten through lugs d and are held in in Fig. 2.

place by keys e, as shown vals so that the valve will be properly uided' when raised and yet will allow the rec flow of steam from the boiler into the casing D and through the pipe E.

It will be noticed that the upper seat 9 and the on G are arran ed oil center in respect to t e casing. This allows the casing to be placed nearer one side of the dome and yet allows the valve to be readil removed through the openin in the ome. This construction leaves su cient room for a person entering, the boiler through the opening in the dome to pass clear of the valve casing. Y

The hollow valve I is operated through the rod N extending to the cab of the locomotive. This rod has a forked extension n, each fork of which is connected to a rocking arm M secured to a transverse pivot m. One of these arms M is'located on each side of the casing D.

Ada ted to the upper portion 5* of the valve is a cross bar S having reduced ends 8, and connectin this cross bar to the pins n of the forke extension n of the rod N are links T, so that when the rod N is moved longitudinally in one direction the valve will be raised ofl its seat. The movement of the valve is slow at first and then gradually increases, owing to the link connection.

The rod S is guided in the upper end of the casing D, being located in slots d in the upper flange, as shown in Fig. 1.

By the above construction the throttle valve can be made and located in such a position as to allow of the free passage into the locomotive boiler through the single opening in the dome, dispensing with additional man hole openings in the boiler, and the valve can be opened and closed with comparatively little efi'ort on the part of the engmeer. It is simple in construction and a meeeoe when necessary, and through the opening the upper' end of the valve and adaptegi to 5 in the dome. guides in the casmg; plvoted arms;

I o1aim:-- 4 connecting the outer ends of the arms so The combination of a locomotive baving'w-the cross bar of the valve; and anoperatm e (iome provided with a man hole opening; a rod also connected 'tothe outer ends of sai casing located Within the dome at one side pivoted arms.

Q thereof and having its upper end; beveled at In testimony whereof, I have signed my 4 one side; an upper seat and a cup shaped name to this specification, in the presenoe of lower seeii; wiibhind'zhe oasinhgfila splder contwo subscribing Witnesses. I v no necein t e ouppe seat wit; 1: e oasin so as no all w for the free passage of steam THUMA'S around; the cup; a hollow valve having an Witnesses: upper and a lower flange adapted. to the two .WM. E. SHUPE, Y seats in the casing; a cross bar connected to WM. A. BARR.

jopiee of tkrla ament may be obaained for five cents each, by addressing the Commissioner of Betentl,

Washington, D0 0. j H 

